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3 years ago

!!!!!!!!!!!HELPPPP!!!!!!!!!!! IT'S A TEST!

1 answer:

3 0

A. Chemical reaction. When the wood burns, new substances form (like ash) and they cannot be changed.

B. Exothermic. When combustion (burning) takes place it is an exothermic reaction. Energy is being released to its surroundings.

hope this helps!

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What is 25.3 X 12.65 before rounding?

maw [93]

Answer:

320.045

Explanation:

4 0

3 years ago

What is the percent of aluminum in al2(so4)3

Lena [83]

Answer : The percent of aluminium in $Al_2(SO_4)_3$ is $15.77\%$

Solution :

Molar mass of Aluminium = 26.98 g/mole

Molar mass of $Al_2(SO_4)_3$ = 342.15 g/mole

First we have to calculate the mass of Aluminium.

Mass of 2 Al atoms = 2 × 26.98 g/mole = 53.96 g/mole

Now we have to calculate the percent composition of Aluminium in $Al_2(SO_4)_3$

$\%\text{ of Al}=\frac{\text{ Mass of Al}}{\text{ Total mass}}\times 100$

Now put all the given values in this formula, we get

$\%\text{ of Al}=\frac{53.96g/mole}{342.15g/mole}\times 100$

$\%\text{ of Al}=15.77\%$

Therefore, the percent of aluminium in $Al_2(SO_4)_3$ is $15.77\%$

7 0

3 years ago

Read 2 more answers

If you compare the solubilities of the noble gases in water, you nd that solubility increases from the smallest atomic weight to

maks197457 [2]

Answer: Option (b) is the correct answer.

Explanation:

When we compare the solubilities of the noble gases in water, then solubility increases from the smallest atomic weight to the largest, Ar < Kr < Xe. This is because more is the atomic weigh of the gas more will be the dispersion forces present in it.

As a result, it will have more number of attractive interactions with the water molecules. Therefore, more is the attraction more will be the solubility of the gas.

Thus, we can conclude that the statement heavier the gas, the more dispersion forces it has, and therefore the more attractive Interactions it has with water molecules, is the best explanation.

7 0

3 years ago

Review the poster.

nataly862011 [7]

Please mark Brainliest!!! have a good day/night!

3 0

3 years ago

Read 2 more answers

six different aqueous solutions are represented in the beakers below, and there total volumes are noted. (a) which solution has

wolverine [178]

The molarity of the solutions are as follows:

solution B has the highest molarity
solutions A, D and F have the same molarity
solutions A and C are mixed together have a lower molarity than B
solution F and D will have the same molarity
Volume of water required to be evaporated is 8.3 mL

<h3>What is molarity of a solution?</h3>

The molarity of a solution is the amount in moles of a substance present in a given volume of solution.

From the image of the solution given:

solution B has the highest molarity
solutions A, D and F have the same molarity
when solutions A and C are mixed, the resulting solution have a lower molarity than B
solution F and D will have the same molarity after 75 mL and 50 mL of water are added to each respectively
the molarity of B is 12/50 = 4/16.7. Volume of water required to be evaporated = 25 - 16.7 = 8.3 mL

Therefore, the molarity of the solutions depends on the moles of substance present per given volume of solution.

Learn more about molarity at: brainly.com/question/24305514

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6 0

2 years ago